Brook failed to impress as he beat a little-known Australian on Saturday (Image: Action Images via Reuters)

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The Sheffield star started sharply but was dragged into a battle after failing to get an early stoppage in front of a half-empty arena in his home city. But Hearn has no fears about the Brook-Khan fight selling.

He said: “It will be the biggest thing going when they get together, because they cannot stand each other. It will be the most epic build-up for a completely 50-50 fight.

“Are they still in the prime of their careers? There is an ­argument that Kell is not as good as when he fought Shawn Porter, maybe Amir is not as good as when he boxed Marcos Maidana. But they’re still world-class fighters.